Sony RMT-B119A - Page 92

Key1 does not operate
Is there voltage of about 3.3V at pin 6 of CN701 without
p
ressin
g
the ke
y
s?
No
Yes
Check the potential voltage CN701
pin6 change from +3.3V to near 0V
when pressing the stop button.
9-6
BDP-
BX39/S390
FR-318 IF board flow chart
Does symptom improve when replace
FR-318
board?
Yes
Which row of keys do not operate?
STOP buttons -> Key1 does not operate
Reference: Relationship of Buttons and Voltages
OPEN/CLOSE button ->
Key2 does not operate
PLAY button -> Key3 does not operate
Input
2.90-3.30
0.00-0.40
KEY0
(S700) (S701) (S702) (S703)
Key_OFF
POWER
KEY1
Key_OFF
STOP
KEY2
Key_OFF
OPEN/CLOSE
KEY3
Key_OFF
PLAY
Reconnect FFC, if symtoms
donot improve, replace FFC
Does FFC disconnected
CN701 or broken
from
Yes
No
Disconnected FFC or
FR-318
board
replace
Reconnect FFC, if symtoms do not improve, replace FFC
Does FFC disconnected
CN701 or broken
from
Yes
Check IC101, B23
Check pattern and S701
might be broken
Yes
Is there voltage of about 3.3V at pin 5 of CN701 without
p
ressin
g
the ke
y
s?
Yes
Check the potential voltage CN702
pin5 change from +3.3V to near 0V
when pressing the stop button.
Disconnected FFC or
FR-318
board
replace
Reconnect FFC, if symtoms do not improve, replace FFC
Does FFC disconnected
CN701 or broken
from
Yes
No
Check pattern and S702
might be broken
Yes
Key2 does not operate
Is there voltage of about 3.3V at pin10 of CN701 without
p
ressin
g
the ke
y
s?
Check IC101 (D20)
Yes
Check the potential voltage CN701
pin10 change from +3.3V to near 0V
when pressing the stop button.
Disconnected FFC or
FR-318 board
replace
Reconnect FFC, if symtoms
do not improve, replace FFC
Does harness disconnected
CN701 or broken
from
Yes
No
Check pattern and S700
might be broken
Yes
Key0 does notoperate
No
No
No
No
CHECK IC101
button ->
Key0 does not operatePOWER
Is there voltage of about 3.3V at pin 4 of CN701 without
p
ressin
g
the ke
y
s?
Yes
Check the potential voltage CN702
pin4 change from +3.3V to near 0V
when pressing the stop button.
Disconnected FFC or
FR-318 board
replace
Reconnect FFC, if symtoms
do not improve, replace FFC
Does harness disconnected
CN701 or broken
from
Yes
No
Check pattern and S703
might be broken
Yes
Key3 does not operate
No
Check IC101, A23
No
Check IC101, A22